Your Guide to choosing a Singapore Doctor

Degenerative disease of the spine is one of the leading causes of disability in the adult population. Most of these patients are treated non-surgically with analgesia, physiotherapy and injections. The majority will get better without surgery. However, a group of patients will continue to experience pain. The chronic nature of spinal pain can be disabling and interferes with the ability to work and participate in regular daily activities. For these patients, surgical treatment becomes necessary.

Surgical treatment for degenerative spine disease has traditionally been spinal fusion. Unfortunately, there are a number of drawbacks to spinal fusion. Firstly, the bone may not be able to heal or fuse. The average success rate of fusion is approximately 80%. Failure of the bone to fuse may be associated with continued symptoms. Secondly, fusion will cause stiffness

and decreased motion of the spine. Thirdly, spinal fusion will cause more stress to be transferred to adjacent levels. This increased stress at the adjacent level may cause further degeneration at the adjacent levels which may lead to additional spine surgery.
Artificial disc replacement is a surgical procedure in which degenerated intervertebral discs in the spinal column are replaced with artificial devices in the lumbar (lower) or cervical (upper) spine. The procedure is used to treat chronic, severe low back pain and cervical pain resulting from degenerative disc disease.

Artificial disc replacement has been developed as an alternative to spine fusion. The introduction of the total disc replacement aims to relieve patient symptoms while preserving motion at the operative spinal level. The advantage of preserving motion is to minimize the stress at adjacent levels and thereby decrease the risk of degeneration of the adjacent segment.
Currently artificial disc replacement can be used for the lumbar or the cervical spine. Many different models have been developed. The majority consists of two metal plates that have teeth to anchor the implant onto the bone of the vertebral bodies. Between the two plates is a metal core or a plastic core made up of polyethylene that allows for motion. Figure 1 shows a lumbar artificial disc replacement. Figure 2 shows a cervical artificial disc replacement.

Figure 1. Lumbar artificial disc

Figure 2. Cervical artificial disc

The clinical diagnoses for lumbar artificial disc replacement include symptomatic degenerative disc disease and post-discectomy syndrome. Post-discectomy syndrome is persistent back pain following previous surgery to remove a

The technique to insert an artificial disc (whether in the neck or low back) is routine and safe. For the cervical spine it involves going from the front of the neck. For the lumbar spine, it involves going through the abdomen. The procedure begins by removing the gelatinous disc between the vertebrae. Once the disc is removed, two metal plates are pressed into the bony endplates above and below the space now vacated by the disc. Metal spikes hold these plates in place on the bone. Eventually bone will grow over and around the metal plates. In between the metal plates is a metal or plastic core made of a polyethylene. Figure 3 shows the artificial disc placed in the spine.

Figure 3. Artificial disc placed in spine

Careful selection of patients for artificial disc replacement is critical. There are several conditions that may prevent patients from receiving a disc replacement. These include spondylolisthesis (the slipping of one vertebral body across a lower one), osteoporosis, vertebral body fracture, allergy to the materials in the device, spinal tumor, spinal infection, morbid obesity, significant changes of the facet joints (joints in the back portion of the spine), pregnancy, chronic steroid use or autoimmune problems. Also, total disc replacements are designed to be implanted from an anterior approach (through the abdomen for lumbar). Patients may be excluded from receiving an artificial disc if they previously had abdominal surgery or if the condition of the blood vessels in front of the spine increases the risk of significant injury during this type of spinal surgery.
In addition to the potential complications associated with general anesthesia, the complications associated with artificial disc replacement may include breakage of the metal plate, dislocation of the implant, infection, nerve injury and injury to blood vessels and urological structures. To help minimize complications associated with the implant itself, proper selection of patients and size of implant is very important. Also, artificial implants may fail over time due to wear of the materials and loosening of the implants.

Recovery from artificial disc replacement and care afterwards are much like that for other anterior approaches to the spine. In some cases, recovery is faster than for a traditional fusion surgery. There is less pain from the

return to activities than occurs after fusion surgery. Fusion patients have limited activities during the time required for the bone graft to grow into a solid mass. Because one of the goals of artificial discs is motion, patients are encouraged to return to motion early, although at a gradual progression. The length and type of activity restrictions following surgery are also much less with disc replacement.

Traditional spine surgery usually requires long incisions. Muscles are cut and moved away from the spine to expose the surgical area. This causes increased pain, long recovery time and impaired spinal function.

With minimally invasive (keyhole) techniques, surgery on the spine can be performed with a wound of only 2-3cm and many of these can be performed as day surgery. Prolapsed intervertebral disc, spinal stenosis and spondylolisthesis are some of the conditions that can be performed with minimally invasive surgery.

Technique

In minimally invasive surgery a tubular retractor is used to dilate the muscles and create a tunnel to expose the spine (Fig 1a,b). Using the tubular retractor, procedures to relieve pressure on the spinal cord and to remove the slipped disc can be performed.

In patients who require spinal fusion to stabilize the spine, the metal screws and rods can be inserted through small wounds (Fig. 2).

patient with back pain and both leg pain which is worse with walking. Patient underwent minimally invasive surgery to relieve the pressure on the spinal nerves. He had rapid recovery with a small wound.

In our fast-paced society, we often look for “quick fix” solutions to quickly remove the pain. We need to understand that in many instances, back or neck pain become obvious as a result of years of “neglect” of the spine. Patients with back or neck pain can become sedentary, or become out of shape, gaining weight that places more strain on the low back. Our goal at the Centre for Spine and Scoliosis Surgery (CSS) is to make your back or neck stronger, more flexible, and thus reducing the chance of further injury. Many of these can be achieved by educating you on the structure and function of the spine, and the lifestyle modifications that may accompany.

While a spinal injection or surgery can help relieve symptoms, not maintaining spinal muscle strength and flexibility, or use of good body mechanics can increase your likelihood of future problems. You have to remember that as you get older,

especially past the age of 40, the back is more prone to injury. You may need to avoid lifting heavy objects, or participating in contact sports involving twisting, bending, and jumping, because these activities can damage your back or neck.

sure your chair molds properly to your back. If you are too short or too tall for your back to rest properly in your chair, or if your company does not offer ergonomically designed chairs, consider bringing in a rolled-up towel. Place it behind your low back to reduce the amount of stress on the back. While sitting, make sure your feet rest flat on the floor. If this is a problem, use a footstool. Proper foot and leg alignment will ease back stress. While typing on a computer, your forearms and thighs should be parallel to ensure proper shoulder alignment. If necessary, use a pad to support your wrists while typing. The monitor should be at eye-level or slightly below eye-level. Last but not least, always get up and move around every half hour, even if it is just a quick stretch by the side of your desk.

Some jobs require standing for many hours at a stretch. People rarely distribute their weight equally onto both legs while standing. They tend to shift their weight from one side to another, throwing the spine out of

Lifting is a common activity in our daily life. When lifting, maneuver the object close to your body, and use the strength in your legs to get the object off the ground, rather than your low back. Whenever possible, your back should not bend forward when lifting something, however light it may appear.Contributing Specialist: